Riveter.



F. J. WEST & H. W. DARBY.

RIVETER.

APPLIGATIGNTILED JULY 8, 19m.

Patented Sept. 30, 1913.

eter constructed so that it can be' readilyv assembled and arranged so that the operator ll rnn'nmcx JAMES WEST AND'HARRY WILLIAM DARBY,

CANADA.

fine-74,396...

RIVETEB;

Specification of Letters Patent. 2 Application filed July 8, 1912. Serial No. 708,239.

OF WINNIPEG, MANITOBA,

Pa'tented Sept. 30, 1913.

To (17? whom, it may concern:

\Vns'r and HARRY WILLIAM DARBY, of the city of 'Winhipeg, in the Province of Main- .--which the followin Be it known that we, FREDRICK James toba, Canada, have invented certain new and useful Improvements in Riveters, of

(r is the specification.

.- The invention relates to an electric riveterJ-and-tho object of the invention is,to

providean' eflicient electrically operated rivjrqcan make or breakthe electric circuit as desired to start orstop the hammer.

A further object of the invention is ,to provide: in an instrument of this kind an 1 Improved method of taking up the recoil of the hammer.

With the above objects in view the invention-consists essentially in the arrangement --;and construction of parts hereinafter more particularly described and later pointed out in the appended claim.

Figure .1. represents a longitudinal sectional view centrall through the riveter, certain parts being s own in side elevation.

L Fig. 2 represents an end view of the riveter.

Fig.3 represents a vertical cross sectional view through the riveter the section being takenin the plane denoted by the line XX' Fi 1. Fig. {1 represents an enlarged de- I tai ed {sectional view of the contact plugs and sockets and the parts carrying the same. In the drawing hkecha'racter's of refer: ence indicate corresponding parts in each havin ,1 represents an outer cylindrical casing the ends 2 and 3 thereof screw .threa ed and the body portion provided -is located 'dir'ctlybp'posite the'e'nd of the tube which bearing receives slidably a shank 11 of a' hammer 12 havin 'the inner end 11 thereof enlarged and s idably mounted end fitted with a permanent collarll which bears normally against the head piece. A spring 14 is mounted on the shank between the bearing 10 and the enlargementll.

15 is a pliinger slidably mounted within the tube 9 which plunger is formed from two, sections, a centralcore 16 ofsteel and an outer covering 17 of soft iron. The core 16 extends beyond one end of the covering and is adapted to hit the head of the hammer when the plunger is reciprocated as later explained.

,18 and 19 are two disks in the form of washers located at the ends ofthe tube or casing.

20 and 21 are insulating tubes having their ends butted against the disks, the tube within the end of the tube 9 and the outer 20 being passed over thetube 9 while that 21 is fitted within the casing.

22, 23, 24 and 25 are magnetic .coilsof the ordinary form comprising each spools 26 carrying fine insulated wire 27, the ends of the wires being connected electrically to contact rings 28 and 29'located on the ends of the spools. end over the guide tube and appear be- The coils are slipped end to tween the insulating disks 20 and 21. Q The contact rings 28 and 29 on the-adjoining ends of the spools touch so as to establish a continuous electrical connection, between the windings. The end of the tube 9 far thest from the hammer is supplied with an internal shoulder 9 against which a steel or other such like metallic disk 30 normally rests being held in this position by the action of a coil spring 31 bearing against the disk and the cap 5.

The end of the handle is fitted with a cap 4' provided with three permanent contact plugs A, B and C adapted to plug into suitable contact sockets E F and G connected respectively with the wires a,b and 0. The cups just mentioned are carried'by a holder 41 formed from porcelain, ebonite or such like material. The contact plug A is connected by a suitable insulated wire a with the con-- tact ring 29 ofthe magnetic coil 25 and the contact plug C-is connected by a suitably insulated wire 0 with the contact ring 28 of the magnetic coil 22. The contact plug B is connected electrically by a suitably insulated wire b with both contact rings 29 and 28 located on the adjoining ends of the 110 The operator will usually close the circuit through the wires 6' when he takes the tool up for use as he will grip the handle tightly and in so doing will press the spring43 in until it makes contact with the spring 44. The wires 6 and c are passed to the outside of the casing as a matte; Jf convenience and are inclosed by a split tube 47 carried by the casing. The wires a, b and c of the tool are connected with any suitable form of appliance old in the art which will establish a closed circuit through the Wires a and b and then through the wires c and 6, those circuits being alternately closed and broken as long as the tool is in use. The switch 42 is of course considered as closed at all times when the tool is in use.

The operation of the tool is as follows Upon the circuit being closed through the wires a and b the magnetic coils 24 and25 are excited through the connecting,

wires a and b with the result that the plunger is. drawn into the said coils. Immediately. this occurs the circuit through the wires F a and b is broken and a circuit is established through the wires 0 and b. This causes the coils 24 and 25 to become inactive while those 22 and 23 are energized with the result'that the plunger is drawn into these'coils and strikes the head of the hammer delivering a blow on the head of the rivet which is being riveted. The plunger will reciprocate backwardly and forwardly within the tube and deal a succession of blows on the hammer as long as the circuits through a b and 0 b are alternately made and broken. The springs 14 and 31 take up to a certain extent the, recoil in the hammer and plunger but this is further accomplished by a magnetic action now explained.

If reference be made to Fig. 1 of the drawings 1t Wlll be seen that the disk 30 is located normally at the end of the magnetic coil 25 and that said coil and. coil 24 when energized will have a constant tendency to draw the disk in the direction indicated by the arrow h accordingly when the plunger is drawn back and hits the disk, it will tend to carry that thecoils 22 and 23 tend to draw it into the center of said coils when they are excited. This tendency of course is normally overcome by the collar 11 on the outer end of the hammer but immediately the hammer is struck by the plunger and moved in the direction indicated by the arrow Z, the magnetic attraction above'described operated to arrest the plunger.

What we claim as our invention is The combination comprisin a brass tube having an internal shoulder ormed in one end thereof, a plurality of similar magnetic coils located on the tube and formed each from a spool'supplied with a wire winding having the ends of the wire terminating in the opposite ends of the spool, contact rings located on the ends of the spools and connected with the ends of the wlres, said rings connecting the coils in series, a casing containing the coils and providedwith an exof the casing and the end of the tube-provided with the shoulder, a metallic disk slidable within the tube and bearing normally against the shoulder, a spiral spring interposed between the cap and the disk, a head piece carried by the opposite ,ends of the casing and tube, a hammer slidably mounted in the head and provided at the outer end with a collar engaging with the head and at the inner end with an enlargement slidably received within the tube, a spiral sprin interposed between the enlargement a oresaid and the head piece, a

plunger adapted to reciprocate within the.

tube and alternately engage with the hammer and the disk, a feed wire passing through the handle and communicating directly with the centrally located pair of contact rings, independent wires passing through the handle and communicating with the contact rings, located on the outer faces of the end coils and push button carried by the handle and inserted in the feed wire, as and for the purpose specified. 191Sgigned at WVmnipeg this 26th day of June,

FREDRIOK JAMES WEST. HARRY WILLIAM DARBY. In the presence of G. S. ROXBURGH, R. Fos'rER.

Copies of this patent may be obtained for Me cents each, by addressing the Commissioner or Patents,

Washington, D. c." 

